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This paper presents a novel concept for direct-pulse-width/position-modulation (PWPM) in an all-digital transmitter by using a parallel baseband PWPM and high speed digital up-conversion. By parallel calculation and subsequent serialization of the digital PWPM signal carrier frequencies above 1 GHz become feasible. PWPM enables the usage of highly efficient switching-mode power amplifiers (SMPA) and...
In this paper the system concept of a radiofrequency digital-to-analog converter (RF-DAC) based multistandard transmitter is presented. The RF-DAC combines DA converter and up-conversion mixer in a single building block. Thereby, the analog baseband blocks are eliminated and replaced by easily reconfigurable digital blocks. Requirements on the digital and mixed-signal blocks are discussed. Spurious...
The design of a multi-GHz digitally controlled oscillator (DCO) achieving low noise and power consumption is presented. The DCO is part of an all-digital phase lock loop (ADPLL) for an FM-radio transmitter prototype chip designed in a 90 nm CMOS process. For this application the oscillator frequency of 3.05-3.45 GHz is divided by 32 or 36 to cover the frequency span of 87.5-108.0 MHz. A wide tuning...
A stereo FM-radio transmitter with Radio Data System (RDS) support based on an all-digital PLL is presented. It has been designed as a fully integrated single-chip transmitter in a 90-nm CMOS technology to be compatible with digital deep-submicrometer processes. Target application of the proposed system is the cointegration with baseband processors and transmitters for mobile communication systems...
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